Denis Istomin finishes the 2018 season 92nd on ATP rankings

The 32-year-old claimed three titles as he earned Chicago Challenger and Almaty Challenger titles after he claimed gold medal in the 2018 Asian Games in Jakarta.

Novak Djokovi, who won Wimbledon and the US Open, finished 1,565 points clear of Nadal after losing the ATP World Tour Finals final to Alexander Zverev.

Zverev, with 6,385 points, is fourth while Federer finished third on 6,420.

Juan Martin Del Potro, Kevin Anderson, Marin Cilic, Dominic Thiem, Kei Nishikori and John Isner make up the top 10.